Queen Elizabeth II and the Duke of Edinburgh during a visit to Stirling Castle, as she marked 70 years since being appointed Colonel-in-Chief of the Argyll and Sutherland Highlanders. (Photo by Jane Barlow/PA Images via Getty Images)
Queen Elizabeth II and the Duke of Edinburgh during a visit to Stirling Castle, as she marked 70 years since being appointed Colonel-in-Chief of the Argyll and Sutherland Highlanders. (Photo by Jane Barlow/PA Images via Getty Images)